Question

所以我正在创建一个应用程序，其中主视图将显示两组集合视图。我试图根据发布的图像中的参数过滤信息的发送方式并将其分发到这两个集合视图中。我的应用程序崩溃了这个错误。

const index = this.schoolsPreview.findIndex((obj) => obj['Property'] === code);

下面我把我的所有代码都放了。

Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value

错误可以在这行代码中找到：

import UIKit
import Parse

class HomeViewController: UIViewController{

    //VAR ARRAYS - LOST
    var userslost = [String: String]()
    var addresslost = [String]()
    var breedlost = [String]()
     var phonelost = [String]()
    var usernameslost = [String]()
    var imageFileslost = [PFFile]()

    //VAR ARRAYS - FOUND
    var usersfound = [String: String]()
    var addressfound = [String]()
    var breedfound = [String]()
    var phonefound = [String]()
    var usernamesfound = [String]()
    var imageFilesfound = [PFFile]()

    //@IBOUTLETS
    @IBOutlet weak var scrollView: UIScrollView!
    @IBOutlet weak var lostView: UIView!
    @IBOutlet weak var foundView: UIView!
    @IBOutlet weak var lostCollectionView: UICollectionView!
    @IBOutlet weak var foundCollectionView: UICollectionView!


    override func viewDidLoad() {
        super.viewDidLoad()

        //QUERY LOST

        let querylost = PFQuery(className: "Post")
        querylost.whereKey("lostfound", equalTo: "lost")
        querylost.findObjectsInBackground { (objects, error) in

            if let posts = objects {

                for post in posts {

                    self.addresslost.append(post["address"] as! String)
                    self.breedlost.append(post["breed"] as! String)
                    self.usernameslost.append(self.userslost[post["userid"] as! String]!)
                    self.imageFileslost.append(post["imageFile"] as! PFFile)

                }
            }
        }

        // QUERY FOUND

        let queryfound = PFQuery(className: "Post")
        queryfound.whereKey("lostfound", equalTo: "found")
        queryfound.findObjectsInBackground { (objects, error) in

            if let posts = objects {

                for post in posts {

                    self.addressfound.append(post["address"] as! String)
                    self.breedfound.append(post["breed"] as! String)
                    self.usernamesfound.append(self.userslost[post["userid"] as! String]!) **--> ERROR IS HERE**
                    self.imageFilesfound.append(post["imageFile"] as! PFFile)

                }
            }

            }


        //TO SHOW DATA

        scrollView.delegate = self
        lostCollectionView.delegate = self
        lostCollectionView.dataSource = self
        foundCollectionView.delegate = self
        foundCollectionView.dataSource = self

        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}

// START OF EXTENSIONS FOR COLLECTION VIEWS

extension HomeViewController: UICollectionViewDelegate, UICollectionViewDataSource {
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        if collectionView == self.lostCollectionView {
            return addresslost.count
            //DUDA #2
        }

        else {
            return addressfound.count
            //DUDA #2
        }
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

        if collectionView == self.lostCollectionView {

            let cell: LostCollectionViewCell = collectionView.dequeueReusableCell(withReuseIdentifier: "Lostcell", for: indexPath) as! LostCollectionViewCell

            //TIENES QUE IGUALAR LOS @IBOUTLETS DEL CELL (SPECIFICOS A LOST) Y IGUALARLOS CON EL ARRAY DE PARSE QUE PUEDES ENCONTRAR EN VARS ARRIBA

            cell.adressLostLabel.text = addresslost[indexPath.row]
            cell.breedLostLabel.text = breedlost[indexPath.row]
            cell.phoneLostLabel.text = phonelost[indexPath.row]

            imageFileslost[indexPath.row].getDataInBackground { (data, error) in

                if let imageData = data {

                    if let imageToDisplay = UIImage(data: imageData) {

                         cell.postedImage.image = imageToDisplay

                    }
                }
            }


            return cell
        }

        else {

            let cell: FoundCollectionViewCell = collectionView.dequeueReusableCell(withReuseIdentifier: "Foundcell", for: indexPath) as! FoundCollectionViewCell

            cell.adressFoundLabel.text = addressfound[indexPath.row]
            cell.breedFoundLabel.text = breedfound[indexPath.row]
            cell.phoneFoundLabel.text = phonefound[indexPath.row]

            imageFilesfound[indexPath.row].getDataInBackground { (data, error) in

                if let imageData = data {

                    if let imageToDisplay = UIImage(data: imageData) {

                        cell.postedImage.image = imageToDisplay

                    }

                }

            }

            return cell
        }

    }

}

//SCROLL

extension  HomeViewController: UIScrollViewDelegate{

    func scrollViewDidScroll(_ scrollView: UIScrollView) {
        print(scrollView)
    }

}

Answer 1

请插入其中，它应该可以工作：

self.usernamesfound.append（self.userslost [post [“ userid”] as？String]？）

尝试将数据从Parse填充到CollectionView时查询错误

1 个答案: